Process for fashioning superposed extrudate

ABSTRACT

In a process for fashioning a portion of a profiled bead ( 2 ), which has been extruded onto an object, in particular a pane ( 1 ), fastened in a treatment station (E), in which process an initially shapeless accumulation of material ( 4 ) is produced in the portion in question, which accumulation of material is given a final shape corresponding to the uniform cross section, of the profiled bead ( 2 ) by means of a moving tool ( 5 ), any excess material being expelled in order to be removed, the mass of material ( 4 ) is produced by the superposition of two portions of the extruded strip, the second portion being deposited after the die (D) has been moved and repositioned. Advantageously, the tool ( 5 ) is, according to the invention, automatically aligned on the profiled bead ( 2 ), immediately after the accumulated material ( 4 ) has been extruded and after the extrusion die (D) has continued its travel, without moving the object, and is brought into contact with this bead. Also described is a device especially suitable for implementing this process.

BACKGROUND OF THE INVENTION

The invention relates to the field of the manufacture of objectsprovided with profiled elements made of plastic, such as windowsprovided with ornamental or sealing strips. It relates more particularlyto a process for fashioning a portion of a profiled bead extruded ontoan object, and to articles resulting therefrom, as well as to a deviceespecially designed to implement this process.

It is generally known to deposit profiled beads of polymer, for examplealong the edge of a pane, by continuous extrusion, and to use themdirectly as a sealing strip, especially for windows fitted into a frameby bonding. Suitable sections of strips help, on the one hand, to centrethe window when fitting it into a frame or chassis, for example into abody opening, and guarantee, on the other hand, the position of thewindow while the adhesive usually employed is curing. Compared with theinjection moulding of such strips, which is also known, extrusion hasthe advantage of greater flexibility since it is not necessary to keep aspecific mould for each shape of pane, but all that is required is toguide an extrusion die of calibrated cross section along the edge of thepane, the extrusion die being controlled by a programmable robot, with adefined, generally continuous, flow of material.

Sometimes it is also required to cover corner parts in the windowopening with the bead of the sealing strip. Compared with the main crosssection of the profiled bead, which is fixedly predetermined by thecalibrated shape of the extrusion die, more material is needed in suchcorner regions. According to Patent DE-C-196 04 397, there exists anextrusion die whose cross section can automatically increase in thecorner regions of a pane. Furthermore, the die comprises two channelsfor supplying the polymer, in each of which the volume flow rate may becontrolled independently of one another by valves. Overall, theadditional material needed compared with the bead of normal profile isextruded in a continuous path with the desired cross section. However,such a die is very expensive to manufacture.

It is also known to subsequently touch up the extruded strip in suchregions where modification of the profile is required, or in “critical”regions such as the join region between the start and end of theextrusion.

Certain existing solutions thus modify the cross section of the bead bycutting off a defined portion of the bead in a corner region or joinregion and by filling the gaps thus created by injecting an additionalmaterial which joins up with the profiled bead (EP-B 0,524,060), or addadditional material for filling the corners by injection onto thecontinuous profiled bead of uniform cross section in a work phase afterthe extrusion (cf. DE-C-195 37 693).

In practice, the windows have hitherto been removed from the extrusionstation before the profiled bead is touched up and are repositioned in aseparate touch-up station. The extrusion station therefore has the bestpossible occupancy since, before injection of additional material orpartial cutting and filling of the gap created, it is necessary to waitfor a hold time until the extruded material has stabilized sufficiently.

It is also already known, from Patent DE 4,445,258 C2, to touch up thejoin region between the start and end of a profiled bead made ofextruded polymer surrounding the edge of a pane by means of a multipartcompression mould which executes a closure movement going from thecentre of the pane towards the external edge so that the excess materialin the join region is expelled to the outside and is detached therefromby a cutting edge carried by the compression tool. However, theparticular direction of operation of that known device leads to a bulkysystem for which there is not enough space in the immediate vicinity ofan extrusion station. Thus, all the windows in that device must also berefitted and repositioned separately.

Another known postforming tool (DE-U-90 11 573) for profiled beads ofextruded polyurethane is also designed in such a way that the panes mustbe positioned with respect to the device and cannot therefore be touchedup directly in the extrusion station.

Touch-up processes with transfer of the window furthermore have thedrawback that the solutions proposed do not always give exactly theexpected result with, in particular, visible transition marks on thepostformed region which are due to the addition of fresh materialalongside the earlier extruded material which has already at leastpartially cured.

It is therefore desired to find improved processes, with a more reliableappearance result, preferably by reducing the cost compared with thatcurrently borne, in the techniques using postforming or fillingespecially by injection moulding, by the succession of steps oftransferring each window provided with the moulded profiled bead out ofthe extrusion station, of fitting and positioning the following touch-upstation and finally of fashioning the critical portion.

Thus, the object of the invention is to present a process which markedlyimproves the touching-up, in particular by decreasing the hold time forthe postforming of critical regions of a profiled bead, especiallycorner regions and/or join regions. A corresponding device, which isalso advantageously as compact as possible, especially suitable forimplementing this process, may also be proposed.

SUMMARY OF THE INVENTION

The subject of the invention is thus a process for the fashioning of aportion of a profiled bead extruded onto an object, in particular apane, in which process an initially shapeless mass of material isproduced in the portion in question and is given the desired final shapeby contact with a shaped surface of a moving tool, any excess materialbeing automatically expelled from the tool in order to be removed,characterized in that the mass of material is produced by thesuperposition of two segments of the extruded strip, with the followingsteps:

the extrusion die is guided along a first segment of the intended pathof the profiled bead, including the portion to be fashioned;

the die is taken away from the object and is moved, relative to theobject, to an adjacent position of the portion to be fashioned;

the die is guided again, along a second segment of the path of theprofiled bead, also including the portion to be fashioned.

The process according to the invention is characterized by the fact thatmaterial needed for the final fashioning is supplied directly at thetime of extrusion, so that after the die has left the region inquestion, the touch-up operation can be started at the same time as theextrusion stops.

The saving in production time represents a certain economical advantage.

Furthermore, since the touch-up operation is started immediately, anydifference in appearance between the region which is extruded ir theusual manner and the region which has undergone the additional treatmentis lessened, since the material of the extruded part has not yet beencured and/or crosslinked significantly by the time the fashioning of theadjacent part is started.

This process is particularly useful for the local production ofparticular shapes in limited regions of the strip, in particular forcorner regions which are more difficult to produce the more acute-angledthe corner.

According to one particular embodiment for fashioning a corner,especially an acute-angled corner, the die is moved relative to theobject by changing the relative orientation of the die with respect tothe object, especially by rotation through the desired angle, and thedie is guided, in the new direction thus obtained, along the followingside of the object.

In one particular case, the first and/or second segment extend/extendsbeyond the perimeter of the object so that the fashioned portionprojects beyond the end face of the object.

In general, it is not necessary to interrupt the flow of material duringintermediate movement of the die.

According to an advantageous variant, the accumulation of material isformed by moving the die, after the first segment has been extruded, bypassing it over that region of the first segment which includes theportion to be fashioned. In the region in question, the material thusforms a kind of ribbon folded back on itself, in which the superposedlayers (or folds) adhere perfectly to each other.

In this regard, the subject of the invention is also novel products,especially:

an article, especially a window, comprising an object provided with aprofiled bead extruded onto the object and having a fashioned portion,characterized in that the fashioned portion consists of a continuousfolded ribbon of extruded material, in which ribbon the opposed surfacesof the fold or folds adhere to each other along a possibly pellicularinterface, which ribbon is fashioned by contact with a shaped surface;

an article, especially a window, comprising an object, especially apane, provided with a profiled bead extruded onto the object and havingat least one corner portion, characterized in that at least one cornerportion consists of the superposition of at least two partial beadswhich adhere to each other along a possibly pellicular interface, whichsuperposed bead portion is fashioned by contact with a shaped surface.

In fact, depending especially on the plastic used, on the extrusionrate, on the ambient temperature or the ambient moisture content, thematerial deposited on the first partial bead may be partially modifiedbefore the material of the second partial bead has been superposed onit. Thus, the plastic in the fashioned region is in general relativelyheterogeneous, although giving the bead sufficient cohesion by therespective layers adhering to each other.

In extreme cases, there may even form on the surface of the firstpartial bead a kind of skin or film which is completely compatible withthe material deposited on top of it just afterwards, but which may bevisible if a longitudinal section of the product is examined.

The extruded material is advantageously of the thermoplastic type, forexample a thermoplastic elastomer (TPE) or a thermoplastic olefin (TPO).Materials not having an excessive tack are preferred so as to facilitatethe fashioning operations, especially the removal of the shaped surface.

With thermoplastics, it may be advantageous to heat the bead portion orportions to be fashioned before and/or during the fashioning.

The object of the invention is also a device for the fashioning of aportion of a profiled bead extruded onto an object—in particular onto apane—fastened in a treatment station, in particular for implementing theprocess according to the invention, in which device a moving calibratedtool may be brought into contact with the said strip portion, comprisingin initially shapeless accumulation of material, and applies against thelatter a shaped surface corresponding to the uniform profile of theprofiled bead, and in which device means are provided for cutting andremoving the excess material, being characterized by the fact that thetool is connected in a locally adjustable manner to the treatmentstation provided for laying down the profiled bead and can be movedbetween a rest position and a working position in contact with theobject fastened in the treatment station, by means of an actuatingdevice, and in that means are provided for the correct and automaticadjustment of the relative position between the tool and the object.

According to a preferred embodiment of the invention, the postformingdevice will be automatically positioned directly after the extrusion ofan accumulation of material at the respective critical point along theprofiled bead, after the extrusion die has continued its travel withoutthe window to be treated having been transferred and also before theextruded material has been cured, in order to give the desireddimensions to that region of the profiled bead in question, so that itmatches, without any transition, the dimensions of the adjacent portionof profiled bead being formed, while any excess material will beexpelled and automatically removed.

Thus, for the same occupancy of the extrusion station, a substantialtime saving will be obtained in the subsequent treatment of the criticalregions of the profiled bead as they can now be formed in line duringthe continuation of the extrusion process, and therefore withoutadditional handling of the window which is positioned only once in theextrusion station.

Further advantages of the process are a substantial reduction in therisk of damage when handling the windows and a reduction in or evenelimination of the costs of touching up for removing the excess materialfrom the bead. Finally, the need for space for the additional touch-upstation in the manufacturing plant also disappears.

In the case of filling corner regions, according to a development of theprocess, the necessary accumulation of material will be produced bytaking the extrusion die away from the edge of the window, rotating itand applying it again at the point of separation by superposing twoprofile portions. Because of the plasticity of the material, theaccumulation is initially shapeless. However, just after the extrusiondie has continued its travel, it will be adjusted to the cross sectionof the profiled bead by means of the automatically positionable tool.

Further features and advantages of the subject of the invention willemerge from the following detailed description and the illustration ofan example of the implementation of a process and of an embodiment of adevice according to the invention.

In the example of the postforming of a corner of a profiled bead made ofthermoplastic elastomer (TPE) which is deposited on a window:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a detail of an extrusion station with which a postformingdevice is associate

FIG. 2 is a view of the corner region immediately before a profiled beadthat has just been extruded is postformed;

FIG. 3 is a view of an embodiment of the postforming tool with anactuating device for applying the tool to the window;

FIG. 4 is a partial sectional view of the postforming tool in FIG. 2,which is in the working position on the window and on the profiled bead;

FIG. 5 is a view of a stop provided for adjusting the postforming toolon the end face of the window—a detail of FIG. 3;

FIG. 6 is a view of a lower part of the mould with a cutting edgeprovided for cutting the excess material—a detail of FIG. 3; and

FIG. 7 is a view of the corner region of FIG. 1 after the postforming.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, a pane 1, for example made of monolithic toughened safetyglass, is positioned and fixed in an extrusion station E. Also includedin this figure, purely schematically, are a support A as well as anextrusion die D which is controlled by a robot. This extrusion diedeposits, directly along one edge, a profiled bead 2 of thermoplasticelastomer (TPE) on the upwardly facing main face of the pane 1. Itsdirection of movement is implicated by an arrow F pointing to the right.It is approximately parallel to the edge of the pane 1. A postformingtool 5, forming part of the extrusion station E, is placed at at leastone of the corners of the pane 1. Here, it is connected to the support Aby a bracket K, which is merely sketched. Thus, it can work directly onthe profiled bead 2 extruded by the die D. The pane need therefore nolonger be firstly removed from the support A and then repositioned. Amore detailed description of this postforming tool 5 and of its methodof operation is given below.

In FIG. 2, an accumulation 4 of TPE has been produced at a corner 3 ofthe pane 1. In the present case, the die D, being guided along a firstside of the pane in the direction of the arrow Fa, has for this purposebeen brought beyond the corner 3 when it has reached the corner regionand has been taken away from the edge of the window. Thus, a first beadsegment 2 a is formed, which includes the portion to be fashioned into acorner. Next, the die is rotated and again placed on the same corner 3.By guiding the die in the new direction of advance along the followingside, in the direction of the arrow Fb, a second bead segment 2 b isformed. It is not necessary to interrupt the extrusion process whentransferring the die.

The extrudate is therefore applied twice in a limited region, in thiscase crossing the superposed portions, in a comparable manner at thestart and end of the profiled bead, except that the deposition of theupper portion follows immediately the deposition of the lower portion.The bead portion 2 b deposited last is on top. However, its material canmix with the covered portion 2 a which has not yet been cured.

This produces an accumulation of material 4 which initially is shapelessand is illustrated here purely schematically.

Depending on the speed of movement of the die and the curing kinetics ofthe extruded material in particular, this shapeless mass, which may haveapproximately the shape of a ribbon folded back on itself when the flowof polymer has not stopped during transfer of the die, may contain, atthe interface between the superposed portions, possibly between thefolds of the ribbon, a pellicular interface due to very limited curingof the material, which pellicular interface in no way impairs the mutualadhesion of the segments 2 a and 2 b and therefore the cohesion of thefashioned region 3, despite its relatively heterogeneous internalstructure.

Just after the extrusion die has left this corner region, to continueapplying the profiled bead 2, the tool 5 is transferred from its restposition, illustrated in FIG. 3, to its working position, illustrated inFIG. 4, by a tilting movement, this taking place well before the end ofthe extrusion process, and therefore without the position or location ofthe window 1 having to be changed. Although any collision between thedie D and the tool 5 is excluded in the rest position, the workingposition—as clearly shown in FIG. 1—lies in the working region of theextrusion die. In the working position, the tool 5 is brought intocontact with the pane 1 and with the profiled bead 2 which can still befashioned. It gives the accumulated material 4, which may still be seenin FIG. 3, its shape and produces the final configuration of the cornerof the profiled bead 2, as illustrated in FIG. 7.

Since the time between the formation of the shapeless mass 4 and theaction of the tool 5 is very short, there is no significant surfacecuring of the bead and the shaped surface of the tool 5 leaves virtuallyno trace on either side of the mould at the boundary of the fashionedregion, this being an appreciable advantage over the known processes.

An even more detailed discussion of the features of the tool 5 and ofits method of operation will be given below. As support 6 for the tool,it is preferred to use a table, or an equivalent, which is firmlyconnected to the extrusion station E (support A and bracket K in FIG.1). The support frame 7 of the tool is movable, in this case swingingabout a pin connected to the base 6. An actuator 8, which here isillustrated by a pneumatic cylinder, is fastened to the support frame 7and causes the tool 5 to undergo a to-and-fro motion between the workingand rest positions.

In addition, the position of the tool is completely adjustable withinthe station so that various shapes of panes can be treated. Theadjustment is illustrated here by the slideways of a carriage. However,the adjustment can also be made in any other suitable manner. Of course,such a tool 5 may be placed, if necessary, at each corner of the pane inthe extrusion station. Should, for example, several corners in aprofiled bead be requested by the window's purchaser, the correspondingnumber of compact postforming tools would then preferably be attached tothe extrusion station in order to achieve the time-saving advantageassociated with the invention.

In the FIG. 3, the postforming tool is open, while FIG. 4 shows it inthe process of working with the closed mould parts. The latter grip withthe edge of the pane 1 on three sides and therefore completely enclosethe profiled bead 2 in a manner known per se. As is apparent in FIG. 1,the movement of the tool 5 towards the pane 1 is preferably executedapproximately in the direction of the bisector of the angle at thecorner 3.

In the embodiment illustrated, a swivel 9 with a spherical head (ball)10 rises up from the support frame 7 towards the tool. This ball is setin a recess 11 in a baseplate 12 of the tool. The said baseplate isflexibly supported, some distance from the support frame 7, by means ofbearing springs 13 (formed here by conical helical springs). It istherefore mounted on the support frame 7 while still being able to movein the three directions about the centre of the ball 10. Furthermore, itcan be oriented (rotated) in its main plane, at least in a limitedfashion. The bearing springs 13 centre it in an initial position. Theangular position of the baseplate 12 with respect to the support frame 7may be preset by means of set screws 14 which are inserted through thebearing springs 13. A temperature probe (not illustrated) may be mountedon the baseplate and serve for regulating a device for heating or formaintaining the temperature of the baseplate.

It is generally advantageous to heat the postforming tool forpostforming the thermoplastic elastomers. In particular, it may beuseful for the joining regions of the portion of profiled bead to bepostformed also to be kept hot so as to obtain a smooth a join aspossible. However, the heating cost is not high in the case of theprocess discussed here, because, between depositing the accumulation ofmaterial and the postforming, only a very short time interval haselapsed and the profiled bead has therefore not yet cooled.

A removable stop 15 is solidly attached to the baseplate 12. An enlargedcomplete view of it is given in detail in FIG. 5. The stop clearly formsa dihedron in the sketch. Machined on the upper face of the stop is asealing rim 16 which is exactly matched to the corner 3 of the pane 1 aswell as to the mould for touching up the peripheral end face of thelatter. For this purpose, this sealing rim may in particular be providedwith a groove. It gradually transforms into a laying surface 17. Achamfer is provided along the outer edge of the laying surface 17, as anengagement bevel for applying the stop 15 against the pane 1.

In FIG. 4, it may be clearly seen that the sealing rim 16 is appliedagainst the external edge (end face) of the pane 1 in the workingposition of the tool 5. The laying surface 17 is placed flat against theunderside of the pane and thus aligns the tool 5 in the plane of theedge of the pane. For this process, no specific driving means isrequired. As reproduced in the illustration, the profiled bead isapplied, by the extrusion die, exactly on the top side of the pane 1 sothat, when the stop 15 is engaged on the pane 1, no polymer material canbe jammed between its peripheral end face and the sealing rim 16.

Thus, when the tool is brought and pressed against the pane by theactuator 8, the baseplate 12—and therefore the entire tool 5—may,together with its movable assembly, be automatically matched preciselyto the position of the pane and to any dimensional discrepancies in thecutting and the size of the end faces of the pane.

The stop 15 is preferably composed of a low-friction plastic, forexample PTFE, since the stop comes up against the pane 1 from belowduring tilting of the tool and slides along this underside. The tiltingmovement may, in general, be also illustrated by a straight insertionmovement. Preferably, the tool is then applied obliquely from the sideof the pane not provided with the profiled bead.

A lower mould part 18, an enlargement of which is illustrated in thesketch in FIG. 6, is furthermore fastened to the baseplate 12. Asmentioned above, the profiled bead 2 is only on the top side of the pane1, with a lip overhanging the perimeter of the pane, and there is nocontact with the peripheral end face. The extrudate to be applied mustbe sufficiently viscous to allow such shaping. The lower mould part 18is fastened, with respect to the stop 15, in such a way that itsupports, from underneath, the region to be postformed (lips) of theprofiled bead 2 and at the same time completely covers the stop 15 withrespect to the extruded mass. Formed on its usually smooth upper face isa cutting edge 19 having a sawtooth cross section. Its abrupt flank (ofsteepest slope in relation to the plane of the pane) is directed towardsthe profiled bead, and its height corresponds to the desired thicknessof the projecting lip of the profiled bead 2. As may be seen in thesketch, the lower mould part makes an angle, the internal side of whichonce again follows the profile of the end face of the pane at a constantdistance from the corner region.

As the upper part of the mould, the tool 5 additionally comprises apunch 20 which may be raised and lowered with respect to the baseplate12 using a cylinder 21. A rigid connection 22 between the cylinder andthe baseplate guarantees that the punch 20 exactly follows theengagement movement as the tool 5 is being applied against the pane 1.On the essentially flat moulding face of the punch 20 there is a gasket23 applied as an additional thickness to the face of the punch. Thethickness of the gasket is predetermined by the desired height of theprofiled bead 2 on the pane 1.

In the rest position and during transfer of the tool into its workingposition, the punch 20 is raised. The opening between the punch 20 andthe lower mould part must be large enough for the raised punch 20 andthe gasket 23 not to come into contact with the profiled bead 2 whilethe tool is being brought into the working position.

After the tool has been automatically aligned on the corner of the pane,the punch 20 is lowered onto the pane 1 using the cylinder 21. Thus, thegasket is placed directly on the top side of the pane 1. In the regionof accumulation of material, i.e. in the acute angle, a cavity or tunnelis now formed which is open on either side of the corner 3 and the crosssection of which corresponds to the normal profile of the profiled beadand is bounded or circumscribed by:

the top side of the pane (on the contact surface provided);

the surface of the lower mould part, shown for example in FIG. 4 asupper portion 18 a of mould part 18, as far as the end of the cuttingedge (below the lip);

the lower face of the compression punch, shown for example in FIG. 4 aslower portion 20 a of punch 20, as far as the gasket; and

the perimeter of the gasket lying on the side facing the edge of thepane.

Along its longitudinal direction, the cross section of this tunnel orcavity may be of any desired shape, so that it is possible to obtain, inparticular, the desired fashioning in the corner region with acorner-shape distended lip, as is illustrated in FIG. 7. If necessary,the corner region may also be fashioned with a rib or the like runningalong the upper face of the profiled bead.

The abovementioned outer perimeter of the gasket 23 thus serves forforming and limiting the edge of the profiled bead 2, facing the middleof the pane, in the corner region. It thus also makes an angle whichcorresponds to the apex angle of the lower mould part and is alignedprecisely with the latter. However, in the corner region, this break issufficiently rounded so that a small expulsion space is formed betweenthe region of material accumulation 4 and the front edge of the gasket.The material expelled towards the middle of the pane during thepostforming can fill this space. On the other side, lying beyond thepane 1, the excess material which is expelled into the abovementionedcavity is cut off between the cutting edge 19 and the lower face of thepunch 20 and falls out of the tool at the latest during return of thelatter to its rest position. Prototypes have demonstrated that, ingeneral, no residue of material continues to adhere to the cutting edge,and that remnants that have adhered may easily be removed. However, thecylinder 21 of the punch 20 must not exert excessively high forces, sothat the rigid connection 22 need no longer be of a particularly robustdesign.

Moreover, the stop 15, the lower mould part 18 with the cutting edge 19and the face of the punch 20 with the gasket 23 are components of thetool which must be manufactured specifically for each shape of pane oreach corner shape, whereas all the other components of the tool may bestandardized for all shapes of pane. The thickness of the gasket 23 andthe height of the cutting edge 19 with respect to the surface of themould part 18 determine, with the greatest accuracy, the distancebetween the punch 20 and the pane 1 and therefore the thickness of thepostformed corner region of the profiled bead 2.

This therefore results overall in a compact and relatively lightweightconstruction of the tool 5, which may consequently be assembled at anexisting extrusion station without having to be overly modified.

The process and the device have admittedly been described in the case ofextrusion onto a pane, but it goes without saying that profiled-beadpostforming by extrusion applied to other objects and materials can alsobe carried out in the manner described without fundamentally departingfrom the steps mentioned here.

We claim:
 1. A process for the fashioning of a portion of a profiledbead extruded along an intended path onto an object, wherein aninitially shapeless mass of material is produced in the portion and isgiven a desired final shape by contact with a shaped surface of a movingtool, with any excess material being automatically expelled from thetool in order to be removed, the improvement wherein the mass ofmaterial is produced by the superposition of two segments of theextruded strip, comprising: guiding an extrusion die along a firstsegment of the intended path of a profiled bead, comprising the portionto be fashioned; moving the die away from the object and, relative tothe object, to an adjacent position of the portion to be fashioned; andguiding the die along a second segment of the path of the profiled bead,also comprising the portion to be fashioned wherein an extrudablematerial continues to be delivered during said moving the die away fromthe object and, relative to the object, to an adjacent position of theportion to be fashioned step.
 2. The process according to claim 1,wherein the die is moved relative to the object by changing the relativeorientation of the die with respect to the object, and by guiding thedie in the new direction thus obtained to fashion a corner in theprofiled bead.
 3. The process according to claim 2, wherein at least oneof the first and second segment extends beyond the perimeter of theobject so that the fashioned portion projects beyond an end face of theobject.
 4. The process according to claim 1, wherein after the firstsegment has been extruded, the die is moved by passing it over a regionof the first segment which comprises the portion to be fashioned.
 5. Theprocess according to claim 1, wherein the moving tool is applied againstthe portion to be fashioned just after the die has left that region ofthe second segment which comprises this portion, in the actual extrusionstation, without the object being moved, transferred or repositioned. 6.The process according to claim 5, wherein the moving tool isautomatically brought from a rest position to its working positionimmediately after the mass has been extruded and the extrusion die hascontinued its travel, is automatically aligned with the profiled beadand is brought into contact with the shapeless mass in order to fashionit.
 7. The process according to claim 1, wherein the object is a pane.8. The process according to claim 2, wherein the die is moved relativeto the object by rotation through a desired angle.
 9. A process forusing a tool to fashion extrudate on a pane comprising: applyingextrudate along a first segment of the pane; applying extrudate along asecond segment of the pane, with the second segment extruded on at leasta portion of the first segment and the extrudate forming a superposedregion defined by contact between the segments; allowing a shapedsurface of the tool to contact and fashion the superposed region;wherein the extrudate is applied to the first and second segments by anuninterrupted extrusion.
 10. The process of claim 9, wherein theextrudate is applied by an extrusion die.
 11. The process of claim 9,wherein the extrudate comprises a profiled bead.
 12. The process ofclaim 9, wherein the superposed region is fashioned into a first portionfor curing and a second portion for removal.
 13. The process of claim12, further comprising: removing the second portion of the superposedregion.
 14. The process of claim 9, wherein the first and secondsegments are disposed proximate at least one edge of the pane.
 15. Theprocess of claim 9, further comprising: heating the tool.
 16. Theprocess of claim 9, wherein the shaped surface comprises an upperportion and a lower portion.
 17. The process of claim 16, furthercomprising: allowing a portion of the extrudate to flow between theupper and lower portions of the shaped surface to form a lip.
 18. Theprocess of claim 9, wherein the superposed region is disposed proximatetwo edges of the pane.
 19. The process of claim 9, further comprising:moving the tool from a first position remote from the superposed regionto a second position proximate the superposed region.
 20. The process ofclaim 9, further comprising: aligning the tool with the superposedregion.
 21. Process for working a portion (3) of a profiled strand (2)extruded on a window (1), in which an initially shapeless material mass(4) is produced in the portion (3) by superimposing two extruded profilesegments (2 a, 2 b) and is shaped to a desired final shape by contactwith a shaped surface of a mobile tool (5), with any excess materialbeing automatically forced back out of the tool for removal, wherein themobile tool (5) is applied to the portion (3) to be worked just afterthe extrusion die (D) has left the area of the second segment (2 b)comprising said portion, in an extrusion station (E), withoutdisplacement, transfer or repositioning of the window (1); wherein themobile tool (5) is automatically brought from a rest position into aworking position immediately following extrusion, and the extrusion die(D) is automatically aligned with the profiled strand (2) and is broughtinto contact with the shapeless material (4) in order to work theshapeless material (4).
 22. The process according to claim 21, whereinthe material mass (4) is produced with the following stages: theextrusion die (D) is guided along a path of the first segment (2 a)provided for the profiled strand (2) comprising the portion (3) to beworked; the extrusion die (D) is moved away from the window (1) and theextrusion die (D) is displaced relative to the window (1) towards aposition close to the portion (3) to be worked, passing above the firstsegment (2 a) proximate the portion (3) to be worked; the extrusion die(D) is guided along a path of the second segment (2 b) of the profiledstrand (2) proximate the portion (3) to be worked.
 23. The processaccording to claim 22, wherein the material mass (4) is further producedwith the following stage: displacing the die (D) relative to the window(1) while changing the relative orientation of the die (D) with respectto the window (1) by rotation in accordance with a desired angle,wherein the die (D) is guided to work an angle (3) in the profiledstrand (2).
 24. The process according to claim 23, wherein at least oneof the first segment (2 a) and second segment (2 b) extends beyond aperiphery of the window (1), so that the worked portion (3) projectsbeyond an edge of the window (1).
 25. The process according to claim 21,wherein material extrudable by the die (D) continues to be supplied ondisplacing the die.
 26. Process for working a portion (3) of a profiledstrand (2) extruded on a window (1), in which an initially shapelessmaterial mass (4) is produced in the portion (3) by superimposing twoextruded profile segments (2 a, 2 b) and is shaped to a desired finalshape by contact with a shaped surface of a mobile tool (5), with anyexcess material being automatically forced back out of the tool forremoval, wherein the mobile tool (5) is applied to the portion (3) to beworked just after the extrusion die (D) has left the area of the secondsegment (2 b) comprising said portion, in an extrusion station (E),without displacement, transfer or repositioning of the window (1);wherein the mobile tool (5) is applied to the portion (3) to be workedduring a continuation of traveling of the extrusion die (D).
 27. Theprocess according to claim 26, wherein the material mass (4) is producedwith the following stages: the extrusion die (D) is guided along a pathof the first segment (2 a) provided for the profiled strand (2)including the portion (3) to be worked; the extrusion die (D) is movedaway from the window (1) and the extrusion die (D) is displaced relativeto the window (1) towards a position close to the portion (3) to beworked, passing above the first segment (2 a) proximate the portion (3)to be worked; the extrusion die (D) is guided along a path of the secondsegment (2 b) of the profiled strand (2) proximate the portion (3) to beworked.